/*
 * File    : DiskManagerImpl.java
 * Created : 22-Mar-2004
 * By      : parg
 * 
 * Azureus - a Java Bittorrent client
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details ( see the LICENSE file ).
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package org.gudy.azureus2.pluginsimpl.local.disk;

/**
 * @author parg
 *
 */

import org.gudy.azureus2.core3.disk.DiskManagerPiece;
import org.gudy.azureus2.core3.util.DirectByteBuffer;
import org.gudy.azureus2.plugins.disk.DiskManager;
import org.gudy.azureus2.plugins.disk.DiskManagerException;
import org.gudy.azureus2.plugins.disk.DiskManagerReadRequest;
import org.gudy.azureus2.plugins.disk.DiskManagerReadRequestListener;
import org.gudy.azureus2.plugins.disk.DiskManagerWriteRequest;
import org.gudy.azureus2.plugins.disk.DiskManagerWriteRequestListener;
import org.gudy.azureus2.plugins.utils.PooledByteBuffer;
import org.gudy.azureus2.pluginsimpl.local.utils.PooledByteBufferImpl;

public class DiskManagerImpl implements DiskManager {
    private org.gudy.azureus2.core3.disk.DiskManager disk_manager;

    public DiskManagerImpl(org.gudy.azureus2.core3.disk.DiskManager _disk_manager) {
        disk_manager = _disk_manager;
    }

    public org.gudy.azureus2.core3.disk.DiskManager getDiskmanager() {
        return (disk_manager);
    }

    public DiskManagerReadRequest read(int piece_number, int offset, int length, final DiskManagerReadRequestListener listener)

    throws DiskManagerException {
        if (!disk_manager.checkBlockConsistencyForRead("plugin", false, piece_number, offset, length)) {

            throw (new DiskManagerException("read invalid - parameters incorrect or piece incomplete"));
        }

        final DMRR request = new DMRR(disk_manager.createReadRequest(piece_number, offset, length));

        disk_manager.enqueueReadRequest(request.getDelegate(), new org.gudy.azureus2.core3.disk.DiskManagerReadRequestListener() {
            public void readCompleted(org.gudy.azureus2.core3.disk.DiskManagerReadRequest _request, DirectByteBuffer _data) {
                listener.complete(request, new PooledByteBufferImpl(_data));
            }

            public void readFailed(org.gudy.azureus2.core3.disk.DiskManagerReadRequest _request, Throwable _cause) {
                listener.failed(request, new DiskManagerException("read failed", _cause));
            }

            public int getPriority() {
                return (0);
            }

            public void requestExecuted(long bytes) {
            }
        });

        return (request);
    }

    public DiskManagerWriteRequest write(final int piece_number, final int offset, PooledByteBuffer data,
            final DiskManagerWriteRequestListener listener)

    throws DiskManagerException {
        DirectByteBuffer buffer = ((PooledByteBufferImpl) data).getBuffer();

        if (!disk_manager.checkBlockConsistencyForWrite("plugin", piece_number, offset, buffer)) {

            throw (new DiskManagerException("write invalid - parameters incorrect"));
        }

        final int length = buffer.remaining(DirectByteBuffer.SS_EXTERNAL);

        final DMWR request = new DMWR(disk_manager.createWriteRequest(piece_number, offset, buffer, null), length);

        disk_manager.enqueueWriteRequest(request.getDelegate(), new org.gudy.azureus2.core3.disk.DiskManagerWriteRequestListener() {
            public void writeCompleted(org.gudy.azureus2.core3.disk.DiskManagerWriteRequest _request) {
                DiskManagerPiece[] dm_pieces = disk_manager.getPieces();

                DiskManagerPiece dm_piece = dm_pieces[piece_number];

                if (!dm_piece.isDone()) {

                    int current_offset = offset;

                    for (int i = 0; i < length; i += DiskManager.BLOCK_SIZE) {

                        dm_piece.setWritten(current_offset / DiskManager.BLOCK_SIZE);

                        current_offset += DiskManager.BLOCK_SIZE;
                    }
                }

                listener.complete(request);
            }

            public void writeFailed(org.gudy.azureus2.core3.disk.DiskManagerWriteRequest _request, Throwable _cause) {
                listener.failed(request, new DiskManagerException("read failed", _cause));
            }
        });

        return (request);
    }

    private class DMRR implements org.gudy.azureus2.plugins.disk.DiskManagerReadRequest {
        private org.gudy.azureus2.core3.disk.DiskManagerReadRequest request;

        private DMRR(org.gudy.azureus2.core3.disk.DiskManagerReadRequest _request) {
            request = _request;
        }

        private org.gudy.azureus2.core3.disk.DiskManagerReadRequest getDelegate() {
            return (request);
        }

        public int getPieceNumber() {
            return (request.getPieceNumber());
        }

        public int getOffset() {
            return (request.getOffset());
        }

        public int getLength() {
            return (request.getLength());
        }
    }

    private class DMWR implements org.gudy.azureus2.plugins.disk.DiskManagerWriteRequest {
        private org.gudy.azureus2.core3.disk.DiskManagerWriteRequest request;
        private int length;

        private DMWR(org.gudy.azureus2.core3.disk.DiskManagerWriteRequest _request, int _length) {
            request = _request;
        }

        private org.gudy.azureus2.core3.disk.DiskManagerWriteRequest getDelegate() {
            return (request);
        }

        public int getPieceNumber() {
            return (request.getPieceNumber());
        }

        public int getOffset() {
            return (request.getOffset());
        }

        public int getLength() {
            return (length);
        }
    }
}
